Could I unlock an AT&T Samsung Captivate to work on Sprint?

I've done quite a bit of research and found that both the captivate and vibrant are very easily unlockable (the code is within the phone and the such) and that they can be used interchangeably on the others network, the vibrant can use at&t's 3g even, the captivate can't use t-mobiles. However, I haven't been able to find out if either of these phones will work on Sprint's network, nor how well.

So could I get one of these other Samsung Galaxy S phones (Vibrant, Captivate, or Fascinate) to work on the Sprint network? And how well?
 
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